Design and Modeling of a Miniature DC–DC Converter

Abstract: The power module for min iature Inertial Nav igation System demanded reduction in volume and footprint and it had to be housed inside the min iature INS package. Three such power modules are required for powering the three electrical chains of miniature INS. Also as demanded by the improved sensor electronics, the peak output power was increased from 57 W to 65 W. The reduction in volume and increase in power demanded power density enhancement of around three times fro m the existing system. The objective of t he paper is to design a dc - dc converter satisfying the required specifications for an input voltage range of 22-36 V and providing mu ltiple outputs +5V, +/-15 V, +/-30V and + 28Vwith a targeted efficiency of >80%. Also grouping the outputs to sets into HMCs was also attempted. The paper discusses various steps right from the topology selection to the design of the components. Design validation using SABER software is also done.

Keywords: Min iaturization, power density improvement, magnetic, Hybrid M icro Circuit (HM C), Lo w Drop out Regulator (LDO)